Riveting device



Jan. 31, 1933. JUNKERS 1,895,668

RIVETING DEVICE Original Filed July 27, 1926 F/y/ H 2 86 7a 75 77 7a 176/! e5 9%: l u

475 as 4 11 70 82 a7 Patented Jan. 31 1933 UNIT D STATES HUGO J'UNKERS, F DESSAU, GERMANY RIVETING DEVICE Original application filed l'uly 27, 1926, Serial No. 125,204, and in Germany August 21,1925. Dividedand this application filed Ianuary 3, 1930. Serial No. 418,249.

-My invention refers to the riveting of tubes or other hollow work pieces as described in my copending a lication for patent of the United States, drial No. 125,204, filed 5 July 27, 1926, according to which an anvilv is inserted in the tube and held in position therein by resilient means in such manner as to give way underthe pressure of the shaft of a rivet which is introduced through a hole in the wall of the tube or the like.

1 The rivet forces back the resiliently supported anvil, and if blows are now struck on the .swage head of the rivet, the inertia of the anvil will upset the rivet shaft to form the closing head. After the anvil has thus acted on the shaft of the rivet, it is jerked back by the resilient means supporting it and then returns into its initial position in which it is ready for reacting under the next blow. struck on the swage head- It is an object of my invention to improve a device of this kind. In the drawing afiixed to'this specification and forming part thereof a device embodying my invention is illustrated diagrammatically by way of example, as applied tothe tubular work piece to be riveted.

' In the drawing v Fig. 1 is an axial section of the anvil and the tube on the line II in Fig.2, and

-- Fig. 2 is a section on the line II-II in Fig. 1. i

eferring to the drawing, 1 is atubatobe riveted, 'is a solid substantially cylindrical anvil having a smaller diameter than I the inside diameter of the tube, the ends ofthe anvil being slightly tapered or otherwise reduced in order to facilitate its introductlon.

90 and 91 are cables or the like by which the bination, an anvil adapted "to serve as an abutment for the rivet and members resilientanvil is fed through the-tube, 84, 85, and

86,. 87 are bores extending across the anvil,

and 75, 76, are spacingmembers projecting from the anvil at opposite ends of thebores'; 79, 80 and 81, 82 are springs supported on a partition 88 in each bore and tending to force the spacing members -outwardly.

These members may be designed in various wa s. For instance the members in the bore 84 have the form of pin '-like'bodies 75 which 0v are fitted to slide in the reduced end por- Rel tions 77 of the bore 84 and are provided with shoulders 89 which prevent them from being forced outof the bores by the sprin s 79, 80. 1 In the bore 85 and also in the and 87, balls 76, 76 are inserted'at either end. The endportions of the boresare reduced to .a diameter which is less than the diameter of the balls so that the balls cannot be forced out of the bores by the springs 81, 82.

The parts 75, 76 are preferably distributed over the perimeter of the anvil in such manner that in its initial position the anvil is substantially coaxial with the tube'l, but is spacedfrom the walls of the tube, as its diameter isless than the inside diameter of the tube 1. When a rivet 8 (Fig. '2) is inserted ina' hole of the tube wall and its swage head is struck by the riveting tool .9,- the resilient re action of the anvil will form a closing head onthe rivet in the manner above described, the blows on the tool 9 being followed by I wish it to be understood that ores 86 k I do not desireto be limited to the exact details of con-n reaction blows of the anvil 4 upon the inner.

struction shownand described for obvious in the art.

In the claims aflixed to thi no selection of any particular modification of'the invention is intended to the exclusion modifications will occur to a person skilled.-

I specification ly mounted in, and partly projecting from all sides against the inner wall of the tube to be riveted, said anvil consisting of a relatively substantial mass which by virtue of the resilient holdin means is capable of delivering blows u to the outer end of the rivet.

cavities of said anvil for spacing same on 2. In apparatus for riveting tubes in combination, an anvil adapted to serve as an abutment for the rivet, springs mounted in radial borings of said anvil and spacing mem- 5. oers partly rejecting from said borings under the action of said springs, said anvil consisting of a relatively substantial mass which by virtue of the resilient holding means .is capable of delivering blows upon the inner and of the rivet, incident to its reaction following blows applied to the outer end of the rivet.

In testimony whereof I afiix my signature. 15 HUGO JUNKERS. 

